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Derivative Financial Instruments Effectiveness Testing (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Foreign Exchange Forward [Member]        
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net   $ 0 $ 0  
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion     0  
Interest Rate Swap [Member]        
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net   0 0 $ 0
Scenario, Forecast [Member] | Foreign Exchange Forward [Member]        
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Realized in the next 12 Months $ 500,000      
Interest Expense [Member] | Interest Rate Swap [Member]        
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion   2,100,000 $ 2,900,000 $ 2,400,000
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Realized in the next 12 Months   (1,700,000)    
Other Income [Member] | Intercompany Loan [Member]        
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion   31,100,000    
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net   18,700,000    
Interest Income [Member] | Foreign Exchange Forward [Member]        
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion   800,000    
Intercompany Loan [Member]        
Foreign Currency Transaction Gain (Loss), before Tax   (31,131,000)    
Foreign Currency Transaction Gain (Loss), Net of Tax   $ (18,679,000)